无机材料学报 ›› 2011, Vol. 26 ›› Issue (7): 715-720.DOI: 10.3724/SP.J.1077.2011.00715

• 研究论文 • 上一篇    下一篇

铝对自反应原位合成复合陶瓷坯件组织结构及性能的影响

刘宏伟1, 王建江2, 马世宁1, 孙晓峰1   

  1. (1. 装甲兵工程学院 装备再制造工程系, 北京 100072; 2. 军械工程学院 先进材料研究所, 石家庄050003)
  • 收稿日期:2010-09-08 修回日期:2010-11-25 出版日期:2011-07-20 网络出版日期:2011-06-20
  • 作者简介:刘宏伟(1978-), 男, 博士, 助理研究员. E-mail: hongwlau@126.com
  • 基金资助:

    国家自然科学基金(51001118, 50672130)

Influence of Aluminum on Structure and Properties of Self-reactive Spray Formed Preforms

LIU Hong-Wei1, WANG Jian-Jiang2, MA Shi-Ning1, SUN Xiao-Feng1   

  1. (1. Department of Remanufacturing Engineering, Academy of Armored Force, Beijing 100072, China; 2. Institute of Advanced Materials, Ordnance Engineering College, Shijiazhuang 050003, China)
  • Received:2010-09-08 Revised:2010-11-25 Published:2011-07-20 Online:2011-06-20
  • Supported by:

    National Natural Science Foundation of China (51001118, 50672130)

摘要: 分别以Ti-B4C-C体系和Ti-B4C-C-Al体系复合粉为反应原料, 利用自反应喷射成形技术制备Ti(C,N)-TiB2基复合陶瓷坯件. 利用XRD、SEM、EDS、TEM等方法, 研究分析了向喷射体系中加入5wt%金属Al对喷射沉积坯件组织结构、主要力学性能的影响及其原因. 结果表明, Ti-B4C-C体系的喷射沉积坯件主要由TiC0.3N0.7和TiB2主相及TiO2副产物相组成, 其致密度、维氏硬度、弯曲强度、断裂韧性等性能分别为97.2%、17.3GPa、387MPa、6.0MPa·m1/2; 喷射体系中添加5wt%金属Al后, 喷射沉积坯件的主相仍为TiC0.3N0.7和TiB2, 但副产物相中不含有害相TiO2, 而增加了对复合材料有益的Al2O3与Ti3Al相, 坯件内TiB2颗粒长径比增大, 出现大量长棒状晶, 并使坯件的致密度、维氏硬度、弯曲强度、断裂韧性等性能也分别提高到97.7%、20.6GPa、425MPa、7.3MPa·m1/2.可见金属Al的添加可有效抑制喷射过程中Ti的氧化, 明显改善喷射沉积坯件的综合力学性能.

关键词: 铝, 喷射沉积坯件, 组织结构, 性能

Abstract: With composite powders of Ti-B4C-C and Ti-B4C-C-Al systems as reactants, Ti(C, N)-TiB2 -based composite ceramic preforms were prepared by self-reactive spray forming technology. XRD, SEM, EDS and TEM were used to investigate the influence of 5wt% Al addition on the structure and properties of the preforms. It was shown that the performs made from Ti-B4C-C system were mainly composed of TiC0.3N0.7 and TiB2, with by-product phase of TiO2. Relative density, Vickers hardness, flexural strength and fracture toughness of Ti-B4C-C preforms were 97.2%, 17.3GPa, 387MPa and 6.0MPa·m1/2, respectively. By adding 5wt%Al in the sprayed system, the by-product of the preforms was the desirable phases of Al2O3 and Ti3Al, not TiO2, though the main phases of Ti-B4C-C-Al preforms remained to be TiC0.3N0.7 and TiB2. The length to diameter ratio of the TiB2 grains increased obviously. As a result, relative density, Vickers hardness, flexural strength and fracture toughness of Ti-B4C-C-Al preforms as-cended to be 97.7%, 20.6GPa, 425MPa and 7.3MPa·m1/2, respectively. The additive Al effectively restrained the oxidation of Ti in the spray forming process, which improved the mechanical properties of the preforms greatly.

Key words: aluminum, performs, structure, properties

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